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Electrical Machines

Electrical Machines
In a dc machine 4 pole lap winding is used. The number of parallel paths are?

 1
 8
 4
 2

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Electrical Machines
In DC generator, brushes are always placed along

 geometrical neutral axis.
 armature axis.
 load axis.
  magnetic neutral axis.

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Electrical Machines
Maximum power will be developed when back emf is

 double the supply voltage.
All of these
 half of the supply voltage.
 equal to supply voltage.

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Electrical Machines
Maximum allowable acidity level of power transformer insulating oil is generally taken as

  1 mg of KOH / gm.
  0.3 mg of KOH / gm.
 0.5 mg of KOH / gm.
 2 mg of KOH / gm.

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Electrical Machines
Series generators are used in which of the following applications?

 Arc welding.
 Used as boosters in dc distribution or transmission.
All of these
 Air crafts.

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Electrical Machines
A smaller air gap in a induction motor helps to

 reduce the chance of cogging.
 reduce the magnetizing current.
 increase the starting torque.
 reduce the chance of crawling.

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